Turn thoughts into reality, literally be able to do anything whenever I wanted and undo any serious mistakes I could have made. For instance know what somebody is thinking if I will it, instantly gain knowledge on a subject if I will it, teleport if I will it, breathe underwater, go back or forwards in time, basically anything you can think to do, you can do.

Sounds great in theory but after knowing everything past present and future, there wouldn't be much left to live for. Would still be a good run though.

From a single cell type of regenerative immortality. I could do so much crazy stuff with that. Like jumping out of planes, playing in traffic, seeing how far I can get under water before the pressure starts to crush me, play with fire....I could light myself on fire and run around. Awesome.